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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23eae222f1f863442b8db67c10facae8aa58ff5c30e4b798291af181ab0fa5d0' 
  AND token = 'lzmLgK/HO8377a+VU48smuyWT5vphhi/GxNr4WG5FOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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