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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282ca44564ed65224fb5a53f76403df66bd4416521b629a45a219def5903b432' 
  AND token = '66ZaoWr/Y7C+Z5SJzNM+snty8lJQnGi8LE1F08H1qzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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