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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a02ffd840bf217d27349b3d3631ba1661dd18f37cef7403a25fc7186c9134a0' 
  AND token = 'MJayeSO7BMf+EG58Hf/EdDuPvxvxNwD9GZbfrDahrh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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