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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2301177dd69771bce580f2154416b029d5fe9eff048ee6bcbd655ef8e28ff196' 
  AND token = '6DKTTtrieRVuHZDDu7ZUPlE4ajSGkzoBjj8wDW13v7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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