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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2ca4fe0bca5b7b9499bf5e840b7c18f10de477fd410907b309454154273732' 
  AND token = 'cWxlJU5OoXZPXnmPs4GitTZZj6g1NdrWmVbSXp2uEtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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