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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9931d1c9d319b7def84474efb06f285a73593596796aeb0ecf469e3f44eadc83' 
  AND token = 'NyoH9QvbhnTPT48dT4ixcuUpBw/4LUWF+We6seXLZLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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