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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d17f38c058719eed5b0bf2e18261dbf4e00e3291fcfeda6c7bbf567494a5563' 
  AND token = 'oB8QD7rc99mj69RPNryPVxcZ8TgVXLQkzQ/e63WMK+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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