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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed19332335f59754df3a81d6b9f8862c384a4eee08c8694a5507f69ad20195a' 
  AND token = 'GTEtciftqg8rARdTX1SZu3+pv/Va869QURlMB5d+6aU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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