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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6019343ae5f3f6d2b6da88b5b79d490fd8de6577d7f9eda0a3726b3a36b86556' 
  AND token = 'KNNIZCltgtyRleaxhPVBgmba7A24h4R629BKLc7vH5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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