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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acafb28f51d2d102cf793d700c7beb86648218b8debc6775a1c669e74a7a410c' 
  AND token = 'LPt7sVhiyxr/d80E7M6oWTYKaGE9yFsogg05vFLTUSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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