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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3480f258f0928f19308ab5bf73f90116c01499e557db801ce1eed88def1bcb87' 
  AND token = 'rhJ8mDFP+oirL0p3WkH3u5x+FDQFrFI6s50x/QktPwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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