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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5a047d59ef4ae8bda35a4555721da4388c18413aa27cd78e0745c5bb6e964c0' 
  AND token = 'fd7ZNOAGLwjYlN7x8y8iB5n2rh7CE6Anguo7ANfnPXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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