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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0d617e49bd3e02a4fb07d0a647643e94182f450fad71829c7dd0fb6cf28ef2' 
  AND token = 'ovdiQW85XvS0L3bDyD8gWijfqcePfYELtCkedacJqT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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