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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703c67510fd55045d3c08ea2003fe84aefc6c155868442bca854aa2993f67b48' 
  AND token = '8ETKt5b8bDjp8I+X5MTA62oMkdx2r7iZQ490VpHHynA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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