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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19831ff1252270690869070be4e1dde1401d67709f027e55df4c4508222825d9' 
  AND token = '+av/fRsHNDgWgXFJB+rOHHsGGZi5I6Z01OgTr6qdIZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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