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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28741a544d4b60302bfdad4379606a22d86c5f16f182c83ac93839f1c19b03e' 
  AND token = 'brnmJ7OUUt1B9x6LkcnSYtDjWKtuc6s7bY8tPyMuXgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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