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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c382bd725181e8424764949a44bddbdefa5690a78b4bf3e537340f54dbf386' 
  AND token = 'sMMo89C8k4V7JknEQWhOjyO64h9UZ7TptIJoEuYWkS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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