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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84effb375e3113f4b43ea454dcdedb8381b1c9e7c7d986f907772aef9822a68f' 
  AND token = 'MKA/gZ0G9Qpx7OHD8Jh66Q2MO5LmxSV62pNHAItQPRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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