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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2781a9e666909a2ec61e2cbb9589f8af6e78059d451a678cf5046a1ccfe752df' 
  AND token = '7pOObPcdyDfCDRktSw7DSWvhlyLB+5fPs6aszNF3qf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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