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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47aa3ef41dbe447aca8ee94b576a0364bd0c5c8c2104b719e505bf51d6da80a' 
  AND token = '00gjJFWLusXvbU9v6uLvG5l88G/LMhLU/mKnEHcEHco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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