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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369aaba49316a4140344b861ac11307f315bfaf3ffb023082929db52fbd6f68d' 
  AND token = '3gp0AClOxUCdFPs6xYIi0Hy75jejZaPPE2A27rBKCKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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