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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f9d1ce2f1a96717d7a762d4f0d86a4b50978a49a2334c8d566090ee7660a2a' 
  AND token = 'hn9LrN67JvxN9lSeABspnBiphY/YRdMqayOp1p1OIfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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