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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51571706399aa99f4ad6b2ad79294f2a918e822015077ed2c793761c9d35996f' 
  AND token = 'FhPj5l64YMDX85W6cSh5qG1eHh/LsNVU2K7SqOXO84s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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