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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094c694402061271287f2454c61034204bc1a2f78c6ac3fc7f51c83fa288f4a3' 
  AND token = 'ns+2Xu240X4BEzHmqmlthsTKAQwTBoPA39B5gs6mEw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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