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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf54fdde3258387fdc1d93158ec46d22422d435e574bf0e200918ee0e6c1558' 
  AND token = '1kSCffczamK44uQTsyDfnjzYyEvyIauE9QNtHTXHNdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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