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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feeddb6e8ac3e9fdf9b7d01f536b3153138b3c02c020c442efeec2b268c0be0e' 
  AND token = 'nycFZCnr103nNuNRLSeGi1L3wb11yjFAJFcKc+7X95Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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