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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bacbb532c7a12370de44c8ba4697654f61d153a9d98914275ecd47895a24080' 
  AND token = '+sYTHRyLgVq8eO543A/oq5ZZSb0bOsv0icglu3U+gP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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