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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7be9716a67c368f71e67016835fded3c30b98a24abb6f198f6d13f38e47cf87' 
  AND token = 'BC0vmnHK7EoTuhS0Ht51j5zDo2mT2owkyfM3sDyUWN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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