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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e058db6b9363e94324bd901b6ebe7b84d3c77e99e8524461e9dabd4a70012d71' 
  AND token = '9GVfjH21byOaiR6e354k7E4qt4T3/p8zvrvdgQgDPq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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