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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5653a909e2be1bd6f118b6bc47aeeb1e718b0ece4e71053df09a907ec1a0696b' 
  AND token = 'blMh8VU+xl2NudUNSBszsX9wqVUYNDlIx9imn+TNyEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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