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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fbadacd30ed9f48e60563e7eec76c629c92bebc922c02565785918c4b2c3b6a' 
  AND token = '9g3u3JcpI2RfzckAUkiNh1V5bGZAZXF6hFN6nvhTUAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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