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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6e035e658d2336be729b16f4d341a0835f3e9cc93d7ab2732080d2bd182046' 
  AND token = '2wwR0Yhi+38j6J6AA1BUtGnHIlqdITwcefaTARIEXmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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