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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5eff41a07527b485f0ea23506eb921c0cb4588a46cb0c4a61a1079634eb9c06' 
  AND token = 'XrjgnTneNSP05MvKg6AC3uCUbSW/s2YjNsBxy5Cyvuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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