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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4316ca867a9160bc6d0eaa824e35d20426866c4cc16ece428a632534f845504b' 
  AND token = 'Fn6gJdDqhlTSqPEHmQj5tb7GRWn7n1O4t3GBy951Avc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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