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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fb8f9b6e18ba16354050ed924273c2ae25e4e83d74103b2d22f5680c0f3c3e' 
  AND token = 'C4EPMtLTyQHbA8IMS6E1naBqonjP/NbD8lQW8j8E05U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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