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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5710a106a0c22e38a5f5a549836d1cd296764a861d22c8ac03fcdfc83b3c3f4c' 
  AND token = 'uiUB/RCNWyI8JHNqnvLq4aINeRpYLEEm/CTqs+7la8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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