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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79750bd9280d51647e311fd1bc3f1b57a0e7daeae52f2684302e627235bc17bc' 
  AND token = 'N3C+3S/yVjoYR7/vw3cqHLCE+WA2Q9Z3nCqdJvusFWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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