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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c670aeaa69c29fbbb939d7f12f4afa0443fe5dbc6902fb8aa24d1131706dfd9' 
  AND token = 'fl8sqx127XgolfLbWfpH2HnbsvQ6SYhmKPwfi6vk/cM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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