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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7ba0d899c1c2416595e6dbb5c60a8301b0b6543ff844d190a5a177bed30092' 
  AND token = 'xLZ5Bm3OoL2JXhPCv4YNruqaLUxsrfCXVtfBrmsTxdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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