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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a30a9f2f3b1de682c462bcac99b0b3fdfd2f96d8cf438037a332f14719c6c30' 
  AND token = 'sLLf92NszfXBvdcAxI8Ft1MGopjclCcWZtgtHeic714=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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