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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dafda31740932e09572f7319d6e9033f45561fbf306fff9f24b180f0a29666f' 
  AND token = '9dDHz/tzkBufp/EeHJBVLo3zDhVQ4yPsUUjWslTxzhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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