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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e84c13c66312a0930cb14423bada105fe69d64bda610501c836f0cb17f67d97' 
  AND token = 'jKv869/AEHfSc8ab2TaPqGtjAwBqHJx8lxsc8AtXXe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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