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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75019f32c99adde54c1e7fad437cab60341e8723f636b7a37cabb06d57e66483' 
  AND token = 'jenbWOVzSgGneVBNHEXELk8wQpwb5IKeNG2DpGtahR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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