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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3390967767c8182f6bacde9b7ab492605a9cd4c9656327ea43663e861452762' 
  AND token = 'tKgUIxv4F0OFgDwrOvb5LTB4ODz2qxl5GO/WxQ/bjFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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