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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b915fcd0d6c65e7d7a9e1e04467efb04d04cdfab6b247dbb8a840422658adb8' 
  AND token = 'qmAfHAH42a121vsfXXNGdniVMsEky1EScoA8YA3dLh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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