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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13afee17729f7d6b02a200f02b0cc33e83bc74177683826671c6caadef97fe6' 
  AND token = 'W97kaztYRI1BAkbF95/a13N8DSNjuD9OrWGo8eZkNUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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