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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57bd97ebfe88d7933a012720268e781ed7db65077662a64c51d5469ff7db5e73' 
  AND token = 'IQm/jQhRz24EfNa+TqUx+Da/TCB8dqm+Gi2XS90A4Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}