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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854c08f871b40df9fae71734e9ae29f477a4bfa2521a2b11f12fc4624a52f1a8' 
  AND token = '+S5BLue8Z6xnSzQxQydClURHMytP94Cuci7WDV/lUhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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