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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b11dd3fa73b32038b8e85a6c330f9c268088daec541211ac26a1264d67bd53' 
  AND token = 'cjSBJ+7NRnSsc/57HavB1u7xk2XJJjii2UByfIBRtFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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