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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd30e81ac1945acca1c1549e39838d2b6551c82e3870131fb430cfe7c217ad1' 
  AND token = 'MvU033IHh9dzFSv8q6pEVs1thRUGhTxqHhiQ99ee5iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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