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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec078527c442d4853a0aa476b3d800f3925c94ca6268f2aea9923cd71e451f5f' 
  AND token = 'PHKfKxDL7VuGMPoM/5mn05SzuBg5DFT9l9UBJcCStCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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